Double boiler



i JAMES Ross summer raro ALTO, .CALrFonNIA- maar erica i `nonnina: Berlina.; i

To all homfzf may concern a citizen'of Canada, and a resident of Palo tion.

Alto; in the county 'of SantaClarafand State of California, have invented ajnew and Improved Double Boiler, of which the following is 'a full, clear, vand'exact descrip- This invent-ion relates to a double boiler, and has for an obgect the provisionof a Vboiler so"`constructed 'that the maximum amount of surface oft-hev inner container is subjected to the direct 'action Aof 'and'V contact with'the boilingV water." Y

Another object resides lin 'l the provision Y 'of means `'whereby 1n 'the ebullitionfof vthe water, due to 'the steam bubbles,l splashing.

YtheWater tout'of the boileris effectively prevented so that the"`objection'able'results thereof are' avoided-and the original-"amount ofwater is kept in' contact with theinner boiler much longer than is usually. the'case.'

outer container.

A still further object resides in the pro-V vision of a boiler wherein the bodyvof water surrounding the inner container is much more ample than has hitherto been provided.

Another object resides in the provision of means whereby this water, when expanded by heat and steam, bubbles (instead ofescaping at the seat of the inner container as inthe ordinary boiler), rushes up into the extension chamber, and the steam and excess water escape through apertures there provided, and the hot water and condensed boiler at the seat of the inner one.

A further object resides in the particular constructionV and .arrangement of parts' which are hereinafter described and claimed and shown in the accompanying drawings.

The invention is illustrated in the drawings, of which v Figure 1 is a vertical section taken through the boiler.

Fig. 2 is a plan view of the boiler with the inner container removed. Y

The double boiler shown in the drawings comprises an outer container having a broad base 1 and a curved cylindrical side wall 2. Along the upper edge of lthe wallQ of the outer Vcontainer an 'inwardly extending vflange such asl 3 is provided ;which, preferably, is' inclined slightly downwardly. vThis {ianget portion is notl very wide.Av Within this "flange portion." '3 a sloping'cu'p- 'sh'aped'liange 4 is formed and onl its inner lower edge is provided with a bead or rolled edge 5 j1n which; any suitable Ystrengthenfing iory reinforcingl means,l such aswire 6,' may bedispos'ed." :With this bead 5a Yshoulder i 7,'formed on yth'e'side wall of the inner container 8, rests. The dimensions'fofthe innerfcontainer with Vrespect Vto"`the outer fcontalner are suchthat when.supported on thebead the-top edge 9V ofthe inner'container extends only slightly -abovethe level Vof thfcuter container. n The; widthand depth of theinnerrcontainer are such that ample space is provided on the sides and. i

at the bottom off the inner container vso that Aplenty o fj waterV surroundsthe inner Ycontainer. Theupper portion Lof the outer `contalnerV between Ythe wall2 andf the down'- w'ardlyjsloping cup-shapedange 4 forms a -sort of extension chamber.' vThe bubbles i olfs'team-fand expanded water riseinto this chamber and, naturally, seek 'anoutlet Along the upper edge of the cup-shaped flange or top plate 4 are provideda 'plurality of apertures 10. These apertures are formedY by cutting the metal of the flange and turning up lips l1 above eachaperture from the metal thusl out. These lips yprojecting slightlyrdownwardly over each aperture 10 will tend to deflect any water and steam which may pass through the apertures 10 Y downwardly along vthe upper surfaceof the cup-shaped or sloping yplate 4 whereby the Vwater or the condensed steam will getback steam, after bathing the upper part of the inner boiler, are again returned to the outer into the outer container between the inner container 8 and the bead 5. It will be apparent, therefore, thatby providing a supporting bead or edge for the inner con-- tainer considerably below the level of the and hot water so that substantially the entireV surface of the Yside and bottom of the inner container is properly and efficiently heated.

Vupper edge of the outer container I am enl The lips 1l act as shields above theaper# tures to prevent the steam and water from the container is formed, but, preferably, theY entire outer container, including the flanges, is made of one piece of material. Of course, each container or vessel is provided with the usual handles l2 and 13.

Nhat l claim is: Y

l. A double boiler comprisingv an outer container having ka downwardly and inwardly sloping flange on itsrupper edge, the lower edge .of the flange adapted to support an inner container, said flange having a plurality of apertures in its surface to permit the escape of fluid from the outer container to the upper surface :of the flange, and means disposed above each aperturevto deflect the fluid downwardly to preventsplashing. l

2. A 'double boiler constructionA comprising an outer container, an inwardly and slightly upwardly sloping narrow flange formed along the upper .edge ofV the container, a second flange portion extending inwardly from theinner edge .of the Yfirst'- mentioned flange and sloping downwardly at a sharp angle for a desired distance, the lower edge of' the second flange adapted to support an inner vessel or container, said second flange portion adjacent the edge of the first flange portion having apertures formed therein,and Va plurality of lips or metal, struck from the metal of the flange portions, extending over said apertures in a line with the direction of the first-mentioned flange portion to form shields over said openings. y y

3. AV double boiler construction compris ing ,an outer container,V an inwardly and slightly downwardly sloping narrow flange formed on its upper edge, a second flange extending inwardly'from the inner edge of the first mentioned flange and sloping ldownwardly sharply a desired distance,the lower I edge of the second flange adapted ,to support an Vinner vessel -or container, and av plurality of lips struck up froni'near the top;

integrally formedron the upper edge of 'the outer container, said cover sloping downwardly and inwardly, and havin-g a :central aperture, the inner edge ofthe cover being reinforced or rolled, a Wire `disposed within the rolled edge of the cover to strengthen the same, a shoulder formed-on'the inner kcontainer and adapted to rest onthe beaded edge of the cover, anda plurality 'of lips lstruck-up from the cover ,near the upper edge` thereof to formapertures inthe cover ,and vpermit the escape of fluid therethrongh,

of plates to deflect the fluid i the lips formin `downwardly and prevent splashing. 1 H JAMES ROSS SilllIllfIkf` 

